Vibration reduction design method for multi-tuned mass dampers for curved steel gates

Abstract

A multi-tuned mass damper vibration absorption design method for an arc-shaped steel gate comprises the following steps that 1, a finite element method is adopted for carrying out dynamic characteristic and power response analysis on the arc-shaped steel gate; 2, the influence of water pressure on the dynamic characteristic of the arc-shaped steel gate is simulated; 3, modal strain energy analysis is carried out on the arc-shaped steel gate to determine the optimal mounting position of an MTMD; 4, a multi-tuned mass damper is mounted on a branch arm of the arc-shaped steel gate; 5, according to the actual stress condition of the arc-shaped steel gate, the number of single-tuned mass dampers in the multi-tuned mass damper, the frequency distribution range of the multi-tuned mass damper and the damping rate of the multi-tuned mass damper are determined through optimization. The multi-tuned mass damper is arranged on the branch arm of the arc-shaped steel gate, the flow induced vibration response of the branch arm and even the whole structure can be effectively reduced under the condition that parameters of the multi-tuned mass damper are reasonable, and the aim of protecting the main structure is achieved.

Description

technical field [0001] The invention belongs to the technical field of damping design of gates in water conservancy projects, and in particular relates to a vibration damping design method for multi-tuned mass dampers used for arc-shaped steel gates. Background technique [0002] The dynamic response of the gate flow-induced load is the product of the coupling between the flow-induced load and the dynamic characteristics of the gate. When the water flow pattern has been determined and the flow induced load cannot be changed, adjusting the dynamic characteristics of the gate can effectively reduce the structural dynamic response. Arc-shaped steel gates are widely used in hydraulic structures due to their light structure, reasonable mechanical performance and small opening and closing force. However, the problem of flow-induced vibration of arc-shaped steel gates is more prominent, and damage caused by flow-induced vibration often occurs in hydraulic structures at home and ab...

AI Technical Summary

Problems solved by technology

[0003] Looking at the damage patterns of arc gates, most of them are caused by the excessive vibration of the support arm, which causes the dynamic instability of the support arm, or the load effect exceeds the material strength, and then the damage occurs

Single-tuned mass damping (TMD) vibration reduction is only effective for a certain resonance frequency. Because steel gates generally work underwater, and the natural frequency is affected by water pressure, the TMD vibration reduction effect is poor.

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